5 - Osteology of the Skull 2

Question 1

Where is the vomer, inferior conchae and the lacrimal bones?

Answer 1

Question 2

What shape should the fontanelles be?

Answer 2

Slightly convex

Question 3

Which bones form the pterion?

Answer 3

Question 4

What are the boundaries of the three intercranial fossa?

Answer 4

Question 5

Label the following features on the frontal bone:

• Orbital plate
• Supraorbital ridge
• Supraorbital notch

Answer 5

Question 6

Label the following features on the ethmoid bone:

• Crista galli
• Cribriform plate
• Perpendicular plate
• Supperior and middle conchae
• Cribriform foramina

Answer 6

• Olfactory nerves through the foramina
• Perpendicular plate connects to vomer
• Crista galli attaches to falx cerebri so CSF rhinorrhea if punched

Question 7

Label the following structures on the sphenoid bone.

Answer 7

Question 8

What nerves pass through all the foramina in the base of the skull?

Answer 8

Foramen ovale bigger as mandibular branch carries motor and sensory innervation

Question 9

Label the foramina of the middle cranial fossa.

Answer 9

• ROLS

- Lacerum is covered in cartilage, ICA runs over the top of it to enter cavernous sinus

- Ovale: mandibular trigeminal

- Spinosum: middle meningeal artery

- Rotundum: maxillary trigeminal

Question 10

When the branches of the trigeminal nerve travel through the foramen rotundum and the foramen ovale, where do they lead to?

Answer 10

R: Pterygopalatine fossa (maxillary branch)

O: Infratemporal fossa (mandibular branch)

Question 11

Label the following parts of the temporal bone.

Answer 11

Question 12

Label the following parts of the occipital bone.

Answer 12

Question 13

What vessel leaves the jugular foramen?

Answer 13

Internal jugular vein from the sigmoid sinus

Question 14

What passes through the infraorbital foramen?

Answer 14

• Infraorbital artery
• Infraorbital vein
• Infraorbital nerve (branch of maxillary nerve)

Question 15

What bones form the hard palate?

Answer 15

• palatine processes of the maxilla
• horizontal plates of the palatine bones.

Question 16

Label the following features of the mandible.

Answer 16

• Mandibular foramen on the inside!
• Condylar process is head and neck

Question 17

Where are the following fossa on the skull and what is their importance:

• Temporal
• Infratemporal
• Pterygopalatine

Answer 17

Question 18

Label this x-ray of a skull and what view is this taaken on

Answer 18

Occipito-mental 30 degrees from horizontal

Question 19

Why does the maxillary and frontal bones have black areas in them?

Answer 19

Sinuses - air spaces

Question 20

Where is the carotid canal?

Answer 20

Middle/Posterior cranial fossa in a triangle with the foramen S and O